编译RcppArmadillo时出现问题-未找到库gfortran

运行：

install.packages("RcppArmadillo")

我得到以下错误：

ld: warning: directory not found for option '-L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin15/6.1.0'
ld: warning: directory not found for option '-L/usr/local/gfortran/lib'
ld: library not found for -lgfortran
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [RcppArmadillo.so] Error 1
ERROR: compilation failed for package ‘RcppArmadillo’
* removing ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/RcppArmadillo’
* restoring previous ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/RcppArmadillo’

The downloaded source packages are in
    ‘/private/var/folders/x8/mrn18h_50g78zbq2jrxcwkx00000gn/T/RtmpK4nz32/downloaded_packages’
Warning messages:
1: In install.packages(update[instlib == l, "Package"], l, repos = repos,  :
  installation of package ‘coin’ had non-zero exit status
2: In install.packages(update[instlib == l, "Package"], l, repos = repos,  :
  installation of package ‘Matrix’ had non-zero exit status
3: In install.packages(update[instlib == l, "Package"], l, repos = repos,  :
  installation of package ‘RcppArmadillo’ had non-zero exit status

所以它毕竟没有安装它。我读了这个链接，但我不能做的解决方案，因为我不知道该怎么做。你能评论一下吗

我甚至试过这么做

install.packages("https://cran.r-project.org/src/contrib/Archive/RcppArmadillo/RcppArmadillo_0.6.100.0.0.tar.gz", repos=NULL, type="source")

同样的错误也出现了

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多亏了JPR，我找到了这个答案，帮助我解决了这个问题。因此，如果您使用linux，请使用他的命令行；如果您使用Mac，请按照本文安装运行库

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您的计算机上缺少运行时库。试一试

sudo apt-get install libgfortan5 libgfortan-8-dev

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我使用的是Mac而不是linux